#!/usr/bin/env python
# -*- coding: utf-8 -*-
"""
usage: coverage_diff.py info_file diff_file > > coverage-diff.info
"""

import sys


def get_diff_file_lines(diff_file):
    """
    Args:
        diff_file (str): File to get modified lines.

    Returns:
        dict: The diff lines of files.
    """
    diff_file_lines = {}

    current_file = None
    current_line = -1

    with open(diff_file) as diff_file:
        for line in diff_file:
            line = line.strip()

            if line.startswith("+++ "):
                current_file = line.lstrip("+++ ")

                diff_file_lines[current_file] = []

                continue

            elif line.startswith("@@ "):
                current_line = line.split()[2]
                current_line = current_line.lstrip("+").split(",")[0]
                current_line = int(current_line)

                continue

            elif line.startswith("-"):
                continue

            elif line.startswith("+"):
                diff_file_lines[current_file].append(current_line)

            current_line += 1

    return diff_file_lines


def get_info_file_lines(info_file, diff_file, SF_start):
    """
    Args:
        info_file (str): File generated by lcov.
        diff_file (str): File to get modified lines.

    Returns:
        None
    """
    diff_file_lines = get_diff_file_lines(diff_file)

    current_lines = []
    current_lf = 0
    current_lh = 0

    with open(info_file) as info_file:
        for line in info_file:
            line = line.strip()
            # startswith()方法用于检查字符串是否是以指定子字符串开头，如果是则返回True，否则返回False。如果参数beg和end指定值，则在指定范围内检查。
            if line.startswith("SF:"):
                current_file = line.lstrip("SF:")

                if current_file.startswith(SF_start):
                    current_file = current_file[len(SF_start) :]

                current_lines = diff_file_lines.get(current_file, [])

            elif line.startswith("DA:"):
                da = line.lstrip("DA:").split(",")

                if int(da[0]) in current_lines:
                    current_lf += 1

                    if not line.endswith(",0"):
                        current_lh += 1

                    print(line)

                continue

            elif line.startswith("LF:"):
                print("LF:{}".format(current_lf))

                continue

            elif line.startswith("LH:"):
                print("LH:{}".format(current_lh))

                continue

            print(line)


if __name__ == "__main__":
    if len(sys.argv) < 4:
        exit()

    info_file = sys.argv[1]
    diff_file = sys.argv[2]
    SF_start = sys.argv[3]

    get_info_file_lines(info_file, diff_file, SF_start)
